Blow-off valve for steam-heated apparatus and the like.



R. RAFPENSDORFER.

BLOW-OFF VALVE FOR STEAM HEATED APPARATUS AND THE LIKE.

APPLICATION FILED DBG.19, 1911. 1 079 663 Patented Nov. 25, 1913.

i lfl i lml l l llllllllll+ COLUMBIA PLANOCIRAPH 60.,WASH1NGTOM v cUNITED STATES PATENT OFFICE.

FRIEDRICH RAFFENSDORFER, :OF GRU'NBERG, SILESIA, GERMANY, ASSIG NOR TOTHE FIRM OF HEINRICH C. SOMMER NACHFOLGER, 0F DUSSELDORF, GERMANY.

BLOW-OFF VALVE FOR STEAM-HEATED APPARATUS AND THE LIKE.

Specification of Letters Patent.

Application filed December 19, 1911.

Patented Nov. 25, 1913. Serial No. 666,714.

To all whom it may concern:

Be it known that I, FRIEDRICH RArFnNs- DORFER, subject of the GermanEmperor, residing at Grtinberg, Silesia, Germany, have invented new anduseful Improvements in Blow-Off Valves for Steam-Heated Apparatus andthe like, of which the following is a specification.

My invention relates to blow-off valves, having a spiral drainage duct,for steamheated apparatus and the like, and a pnmary object is toprovide an improved valve of this type which can be regulated withinwider limits than those known heretofore.

To these ends, in contradistinction to known valves of this type, thespiral duct in my valve which conducts away the water of condensationenlarges in section toward its discharge outlet.

Further my improved blow-off valve comprises not only a'special valve,whereby in creased capability of regulation of the out flow of the waterof condensation is obtained, but also an additional valve suitablyunited with the said special valve and serv ing to quickly blow off thewater while the steam-heated apparatus is being preliminarily heated bythe steam.

One illustrative embodiment of the invention and a modification thereofare represented in vertical section by way of example in theaccompanying drawing, which shows one form of my improved blow-offvalve.

Referring to the drawing, the numeral 1 designates the casing in whichis located the fitting 2 which is provided with a screwthread 3 which,throughout its length, engages the casing 1. The groove between theconvolutions of the screw thread 3 are of increasing depth therebyforming a spiral duct 4, the cross section of which increases from theupper end of the fitting to the lower end thereof.

The fitting 2 has at the top an annular groove 5 and is formed above itas a closure plate 6 which fits the casing and is provided withperforations 7 The fitting 2 has in the middle a longitudinal bore 8which enlarges conically at the top at 9 and at the bottom at 10.

The casing is bored cylindrically above the plate 6 and has a lateralbranch pipe 11 for admitting the water of condensation.v The plate 12can be moved in the casing by means of the screw-threaded spindle 13.The plate 12 has holes 14 passing through it. The screw-threaded spindle13 can be conveniently adjusted by the hand-wheel 18 whose rotation canbe checked by a catch 15.

The bore 8 can be closed below by a screwthreaded spindle 16. This endof the bore is opened only when the total water of condensation is to berapidly blown ofi during the preliminary warming.

The water of condensation enters through the branch 11. According to theheight which the plate 12 is lifted for the time being, the water ofcondensation passes through a space of smaller or larger crosssectionbetween the plate or valve disk 12 and the plate or seat 6 into the duct4. That the connection with the central channel 8 is also established isof no importance because this is generally closed by the spindle 16. Thewater of condensation issues at 17. The holes 14 in the valve disk 12also establish a connection between the admission pipe 11 and the middlechannel 8 when this valve is closed. Thus when the valve 12 is closed,

the pipe 11 can be directly connected with.

the dlscharge pipe 17 by slniply opening the valve 16. By means of theholes 141 a connection between the pipe 11 and the spiral duct at isalso established when the valve 12 is lifted a distance such that itlies below the end of the pipe 11.

I claim 1. In a blow-off valve for steam-heated apparatus, thecombination, with a casing having an inlet at one end and an outlet atthe other end thereof, of a fitting there in bearing against the wallsof the casing, said fitting having a spiral groove in the peripherythereof forming with the walls of the casing a duct, of a comparativelysmall cross-section, that cross-section increasing from the inlet end ofthe fitting toward the outlet end.

2. In a blow-01f valve for steam-heated apparatus, the combination, witha casing having an inlet at one end and an outlet at the other endthereof, of a fitting therein bearing against the walls of the casing,said fitting having a spiral groove in the periphery thereof formingwith the walls of the casing a duct, of a comparatively smallcross-section, that cross-section increasing from the inlet end of thefitting toward the outlet end, the said fitting having a longitudinalcentral bore, a valve disk for closing the inlet end of said bore, and avalve disk for closing the outlet end of the same.

3. In a blow-off 'valve for steam-heated apparatus, the combination,with a casing having an inlet at one end and an outlet at the other endthereof, of a fitting therein loearing against thewalls of the casing,said fitting having a spiral groove in the periphery thereof formingwith the walls of the casing a duct, of a comparatively smallcrosssection, that cross-section increasing from the inlet end of thefitting toward the outlet end, the said duct being in open communicationwith the said outlet, the said fitting having one or more holes in theinlet end thereof communicating with said duct and having a longitudinalbore, a valve disk for closing the inlet end of said bore and a valvedisk for closing the outlet end of the same.

4. Ina blow-off valve for steam-heated apparatus, the combination, witha casing having an inlet at one end and an outlet at the other endthereof, of a fitting therein bearing against the walls of the casing,said fitting having a spiral groove in the periphery thereof formingwith the walls of the casing a duct, of a comparatively smallcross-section, that cross-section increasing from the inlet end of thefitting toward the outlet end, the said duct being in open communicationwith the said outlet, the said fitting having one or more holes in theinlet end thereof communicating with said duct and having a longitudinalbore, a valve disk for closing the inlet end of said bore and a valvedisk for closing the outlet end of the same, the former valve diskhaving one or more holes through the same leading to the said bore,

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRIEDRICH RAFFENSDORFER.

\Vitnesses ERNST SANDER, Guonon A. MAKmsoN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. G.

